Fw: Re: New radio PIDs, more than 8 characters

[M Clark]

Thanks for coding help but, the problem is worse (for me...),
PID w172vg029mkl852
Business Matters - Former US Vice President Al Gore on Climate Change (w172vg029mkl852)

So not even 8 characters.  Other World Service Series (?) have similar PIDs now, e.g. Weekend, World Update.

And I thought I was the only one who listened to WS!

M.


> Sent: Sunday, August 13, 2017 at 10:05 AM
> From: "Ralph Corderoy" <ralph at inputplus.co.uk>
> To: get_iplayer at lists.infradead.org
> Subject: Re: New radio PIDs
>
> Hi Vangelis,
> 
> > ...to begin with either "b0" or "p0".
> > 
> >  New radio PIDs like "w3csv1y9" or "w3csvnyc", beginning with "w3",
> ...
> >     [bp]0[a-z0-9]{6}
> > with
> >     [bpw][a-z0-9]{7}
> 
> Other approaches, getting gradually more specific.
> 
> ^[bpw][03][a-z0-9]{6}$
>     But this allows b3.
> 
> ^(b0|p0|w3)[a-z0-9]{6}$
>     This is precise, but it's common to factor out alternations since
>     each is tried in turn, so...
> 
> ^([bp]0|w3)[a-z0-9]{6}$
>     This is as precise.
>     
> The remaining problem is the `()' "capture" what matches for retrieval
> by the program afterwards as $1, $2, ...  By introducing another set of
> `()' we'd have affected the position of any that come afterwards in the
> same regexp.  (None in this case.)  It's also inefficient to capture
> when it's unnecessary.  `()' can be marked as non-capturing with `?:'.
> 
> ^(?:[bp]0|w3)[a-z0-9]{6}$
> 
> These regexps aren't specific to Perl, BTW, but are useful with egrep,
> awk, Python, etc.
> 
> -- 
> Cheers, Ralph.
> https://plus.google.com/+RalphCorderoy
> 
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